So tomorrow I will be picking up my m3 which has been in storage for a month after I completed the lease assumption.

The original lessor just told me that the tires are filled with nitrogen and I should refill them with nitrogen when the pressure gets low.

My question is-

If I can't find a nitrogen refill station or if I just don't want to pay for nitrogen, can I just add regular air to them mixed with the nitrogen that is already in there or would I need to completely deflate the tires all all nitrogen and then refill with regular air?

I've read some of the supposed pro's of nitrogen but I just think for my normal street use it would be a waste of money.

Leave nitrogen for airplane tires, which see drastic temperature changes in the same day. On a car, it's like using premium gas when regular is required: overkill. You're better off checking your tire pressures regularly. Which you have to do even with nitrogen, as it also slowly leaks over time. Take care.

The reason for using something other than air-you-breathe is to eliminate water vapor from inside the tire. So race teams use dry nitrogen or co2.

Unknown water vapor content makes it difficult to predict tire pressure changes as the tire gains heat. You can be reasonably certain that the air compressor used to mount your tires has created an amble amount of water vapor in the air supply, to say nothing of the fluid used to make it easier to slip the tire on the rim. So you need to evacuate the tire after mounting and setting the bead, then fill with dry nitrogen (or co2).

Go helium, not hydrogen. Hydrogen has that whole "highly flammable" issue. Helium is almost as light, and not flammable. But those smaller molecules will permeate out through the rubber faster. So save your money and buy some titanium lug bolts

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